网页js换肤功能

换肤功能

目的是为了点击按键更换背景颜色，背景图片等功能（其实就是切换css），并且会保存cookies到本地，避免刷新后恢复默认样式

纯属个人备份，非喜勿扰！

JS

function setActiveStyleSheet(title) {
var i, a, main;
for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
a.disabled = true;
if(a.getAttribute("title") == title) a.disabled = false;
}
}
}

function getActiveStyleSheet() {
var i, a;
for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title");
}
return null;
}

function getPreferredStyleSheet() {
var i, a;
for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
if(a.getAttribute("rel").indexOf("style") != -1
&& a.getAttribute("rel").indexOf("alt") == -1
&& a.getAttribute("title")
) return a.getAttribute("title");
}
return null;
}

function createCookie(name,value,days) {
if (days) {
var date = new Date();
date.setTime(date.getTime()+(days*24*60*60*1000));
var expires = "; expires="+date.toGMTString();
}
else expires = "";
document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
var nameEQ = name + "=";
var ca = document.cookie.split(';');
for(var i=0;i < ca.length;i++) {
var c = ca[i];
while (c.charAt(0)==' ') c = c.substring(1,c.length);
if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
}
return null;
}

window.onload = function(e) {
var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);
}

window.onunload = function(e) {
var title = getActiveStyleSheet();
createCookie("style", title, 365);
}

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);

html

<link rel="stylesheet" type="text/css" href="style.css" />
<link rel="stylesheet" type="text/css" href="style-red.css" />
<link rel="stylesheet" type="text/css" href="style-green.css" title="name_one" />
<link rel="stylesheet" type="text/css" href="style-purple.css" title="name_two" />

<!-- 样式切换 -->
<div id="style">
    <a id="red" href="#" onclick="setActiveStyleSheet('',1); return false;">红</a>
    <a id="green" href="#" onclick="setActiveStyleSheet('name_one',1); return false;">绿</a>
    <a id="purple" href="#" onclick="setActiveStyleSheet('name_two',1); return false;">紫</a>
</div>
<!-- /样式切换 -->

css

/*style*/
#style{padding: 40px 0 2px 10px;
float: rightright;}
#style a{padding: 8px;color: #fff;border: 1px #ccc solid;}
#red{background: #F45F7D;}
#green{background: #78bc27}
#purple{background: #9933cc}